package lexicalAnalizer;

import java.io.Serializable;

/**
 * Describes the input token stream.
 */

@SuppressWarnings("all")
public class Token implements Serializable {

  /**
   * The version identifier for this Serializable class.
   * Increment only if the <i>serialized</i> form of the
   * class changes.
   */
	private static final long serialVersionUID = 1L;

  /**
   * An integer that describes the kind of this token.  This numbering
   * system is determined by JavaCCParser, and a table of these numbers is
   * stored in the file ...Constants.java.
   */
	public int kind;

  /** The line number of the first character of this Token. */
	public int beginLine;
  /** The column number of the first character of this Token. */
	public int beginColumn;
  /** The line number of the last character of this Token. */
	public int endLine;
  /** The column number of the last character of this Token. */
	public int endColumn;

  /**
   * The string image of the token.
   */
	public String image;

/**
 * A reference to the next regular (non-special) token from the input
 * stream.  If this is the last token from the input stream, or if the
 * token manager has not read tokens beyond this one, this field is
 * set to null.  This is true only if this token is also a regular
 * token.  Otherwise, see below for a description of the contents of
 * this field.
 */
	public Token next;

/**
 * This field is used to access special tokens that occur prior to this
 * token, but after the immediately preceding regular (non-special) token.
 * If there are no such special tokens, this field is set to null.
 * When there are more than one such special token, this field refers
 * to the last of these special tokens, which in turn refers to the next
 * previous special token through its specialToken field, and so on
 * until the first special token (whose specialToken field is null).
 * The next fields of special tokens refer to other special tokens that
 * immediately follow it (without an intervening regular token).  If there
 * is no such token, this field is null.
 */
	public Token specialToken;

	/**
	 * An optional attribute value of the Token.
	 * Tokens which are not used as syntactic sugar will often contain
	 * meaningful values that will be used later on by the compiler or
	 * interpreter. This attribute value is often different from the image.
	 * Any subclass of Token that actually wants to return a non-null value can
	 * override this method as appropriate.
	 */
	public Object getValue() {
	    return null;
	}
	
	/**
	 * No-argument constructor
	 */
	public Token() {
		
	}
	
	/**
	 * Constructs a new token for the specified Image.
	 */
	public Token(int kind){
	    this(kind, null);
	}
	
	/**
	 * Constructs a new token for the specified Image and Kind.
	 */
	public Token(int kind, String image){
	    this.kind = kind;
	    this.image = image;
	}
	
	/**
	 * Returns the image.
	 */
	public String toString(){
	    return image;
	}
	
	  /**
	   * Returns a new Token object, by default. However, if you want, you
	   * can create and return subclass objects based on the value of ofKind.
	   * Simply add the cases to the switch for all those special cases.
	   * For example, if you have a subclass of Token called IDToken that
	   * you want to create if ofKind is ID, simply add something like :
	   *
	   *    case MyParserConstants.ID : return new IDToken(ofKind, image);
	   *
	   * to the following switch statement. Then you can cast matchedToken
	   * variable to the appropriate type and use sit in your lexical actions.
	   */
	public static Token newToken(int ofKind, String image){
		switch(ofKind){
	      	default : 
	      		return new Token(ofKind, image);
	    }
	}
	
	/***/
	public static Token newToken(int ofKind){
		return newToken(ofKind, null);
	}

}

